<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图 -->
        <el-card>
            <!-- 提示区域 -->
            <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
            <!-- 步骤条区域 active 属性表示要激活的步骤 activeIndex - 0 自动转化为数字-->
            <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>

            <!-- tab栏区域 activeIndex 属性自动绑定的值是 name 属性值 -->
            <!-- 以下的el-tabs标签和el-tab-pane标签必须相互连着，中间不允许有新的标签 -->
            <!-- 以下用el-form表单包裹整个tabs标签页 -->
            <el-form
                :model="addForm"
                :rules="addFormRules"
                ref="addFormRef"
                label-width="100px"
                label-position="top"
            >
                <el-tabs
                    :tab-position="'left'"
                    v-model="activeIndex"
                    :before-leave="beforeTabLeave"
                    @tab-click="tabClicked"
                >
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <!-- options表示数据源 -->
                            <el-cascader
                                v-model="addForm.goods_cat"
                                :options="catelist"
                                :props="cateProps"
                                @change="handleChange"
                            >
                            </el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <el-form-item
                            :label="item.attr_name"
                            v-for="item in manyTableData"
                            :key="item.attr_id"
                        >
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox
                                    :label="cb"
                                    v-for="(cb, i) in item.attr_vals"
                                    :key="i"
                                    border
                                >
                                </el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item
                            :label="item.attr_name"
                            v-for="item in onlyTableData"
                            :key="item.attr_id"
                        >
                        <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <!-- action：表示图片要上传到的后台URL地址 -->
                        <el-upload
                            :action= uploadURL
                            :on-preview="handlePreview"
                            :on-remove="handleRemove"
                            list-type="picture"
                            :headers="headerObj"
                            :on-success="handleSuccess"
                        >
                            <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 富文本编辑器组件 -->
                        <quill-editor v-model="addForm.goods_introduce"/>
                        <!-- 添加商品的按钮 -->
                        <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>
        <!-- 图片预览对话框 -->
        <el-dialog
            title="图片预览"
            :visible.sync="previewVisible"
            width="50%"
        >
            <img :src="previewPath" class="previewImg">
        </el-dialog>
    </div>
</template>

<script>
export default {
  name: 'Add',
  data() {
    return {
      activeIndex: '0',
      // 添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        // 图片的数组
        pics: [],
        // 商品的详情描述
        goods_introduce: '',
        attrs: []
      },
      addFormRules: {
        goods_name: [{ required: true, message: '请输入商品名称', trigger: 'blur' }],
        goods_price: [{ required: true, message: '请输入商品价格', trigger: 'blur' }],
        goods_weight: [{ required: true, message: '请输入商品重量', trigger: 'blur' }],
        goods_number: [{ required: true, message: '请输入商品数量', trigger: 'blur' }],
        goods_cat: [{ required: true, message: '请选择商品分类', trigger: 'blur' }]
      },
      catelist: [], // 商品分类列表， 注意是一个数组
      cateProps: {
        expandTrigger: 'hover',
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      manyTableData: [], // 动态参数列表数据
      onlyTableData: [], // 静态属性列表参数
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload', // 上传图片的URL地址
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      }, // 图片上传组件的headers请求头对象
      previewPath: '',
      previewVisible: false // 控制图片预览对话框的开启与关闭
    }
  },
  methods: {
    // 获取所有商品数据分类
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('请求商品分类数据失败')
      }
      this.catelist = res.data
      console.log(this.catelist)
    },
    // 级联选择器选中项变化，会触发这个函数，实现功能：只能选择三级分类
    // 将联级选择器所绑定的 Id 数组清空即可
    handleChange() {
      console.log(this.addForm.goods_cat)
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    // oldActiveName表示离开的 el-tab-pane 标签页的 name 属性值
    // activeName表示即将进入的 el-tab-pane 标签页的 name 属性值
    // return false 表示标签页跳转不了
    beforeTabLeave(activeName, oldActiveName) {
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类！')
        return false
      }
    },
    // 动态参数面板
    async tabClicked() {
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: 'many' }
        })
        if (res.meta.status !== 200) {
          return this.$message.error('获取动态参数列表失败！')
        }
        console.log(res.data)
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(',')
        })
        this.manyTableData = res.data
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: 'only' }
        })
        if (res.meta.status !== 200) {
          return this.$message.error('获取静态属性列表失败！')
        }
        console.log(res.data)
        this.onlyTableData = res.data
      }
    },
    // 处理图片预览效果
    handlePreview(file) {
      console.log(file)
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 处理移除图片的操作，file参数表示的是图片的信息，不用自己传进来。
    handleRemove(file) {
      console.log(file)
      const filePath = file.response.data.tmp_path
      this.addForm.pics = this.addForm.pics.filter(item => item.pic !== filePath)
      console.log(this.addForm)
    },
    // 监听图片上传成功的事件
    handleSuccess(response) {
      console.log(response)
      const picInfo = { pic: response.data.tmp_path }
      this.addForm.pics.push(picInfo)
      console.log(this.addForm)
    },
    // 添加商品
    add() {
      this.$refs.addFormRef.validate(async vaild => {
        if (!vaild) {
          return this.$message.error('请填写必要的表单项！')
        }
        // this.addForm.goods_cat = this.addForm.goods_cat.join()
        // 执行添加到业务逻辑
        const form = { ...this.addForm }
        form.goods_cat = form.goods_cat.join()
        // 处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join()
          }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        console.log(form)
        // 发起请求，添加商品，注意：添加的商品的名称必须是唯一的
        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status !== 201) {
          return this.$message.error('添加商品失败！')
        }
        this.$message.success('添加商品成功！')
        this.$router.push('/goods')
      })
    }
  },
  // goods_cat[2] 表示三级分类Id
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  },
  mounted() {
    this.getCateList()
  }
}
</script>

<style lang="less" scoped>
    .el-checkbox {
        margin: 0 10px 0 0 !important;
    }
    .previewImg {
        width: 100%;
    }
    .btnAdd {
        margin-top: 15px;
    }
</style>
